Roofing accessories

Dimos has been manufacturing slate hooks for 18 years, and offers every possible combination of material, shape and size to meet all roofers’ needs.

Dimos, manufacturer
of slate hooks since 2001

Dimos began manufacturing slate hooks in 2001 following the acquisition of Dirickx’s production operations, which date back to 1939. Dimos is now one of the world’s 4 leading players in the manufacture of slate hooks.

All our hooks are manufactured on our production site located in Ancenis, (Pays de la Loire, France) which can produce up to 3,000 tons of hooks each year.

All our slate hooks comply with EN 10088-3, and have been tested and approved by the French technical centres CETIM and LNE. With our CNC machinery, we can produce custom-made hooks on demand, even in small batches.

The main features
of a slate hook

There are almost endless possible combinations of slate hooks depending on a dozen criteria which can vary according to regional differences in climate and architecture. Here are the main features:

  • A – material composition: Copper, 18/10 Equinox, 17% Grinox, 17% Stainless steel, 18/10 Stainless steel
  • B – fixing method: clip passed around the batten, or nail driven into wood
  • C – shape of rod/shaft: straight, twisted, rippled (to prevent the rise of water through capillary action between two overlapping fibre-cement slates) or Crosinus (for low sloping, natural slate or fibre-cement roofs with a large overlap)
  • D – hooked end: for fastening the slate
  • E – hook length
  • F – opening of batten clip: depending on the thickness of the batten
  • G – opening of hook end: depending on the thickness of the slate
  • H – nail diameter
  • I – length of point/nail end

of material

When it comes to hooks, their material quality and surface treatment are decisive factors in a roof’s aesthetics and longevity. It is therefore essential to choose the right type of hook depending on your environment:

  • Unpolluted rural area: As a minimum, Dimos recommends its 17% stainless steel range, in accordance with French standards DTU 40.11. and DTU 40.13.
  • Salt air: some materials cannot withstand the high degree of airborne salinity, which is corrosive.
  • Industrial pollution: Around industrial areas, the air is loaded with sulphur dioxide, which attacks stainless steel. Only 18/10 stainless steel can protect the quality of a roof over the long term.

An appropriate material should be chosen depending on the installation conditions:

  • Copper (99% copper wire): enhances the roof’s natural beauty, offers good resistance to corrosion, and limits the growth of moss.
  • 17% stainless steel (ferritic stainless steel wire, 17% chromium): this is the minimum stainless steel grade specified by DTU 40.11 and DTU 40.13. It offers good mechanical and corrosion resistance, but is not recommended for use near the sea or in an industrial atmosphere.
  • 18/10 stainless steel (austenitic stainless steel, 18% chromium, 10% nickel): this alloy offers excellent resistance to atmospheric corrosion as well as good mechanical resistance. It is recommended for use in urban, marine and industrial areas.
  • 17% Grinox (17% stainless steel with anthracite colour resin): this material offers the same advantages as 17% stainless steel but is coated with a layer of anthracite coloured resin. This makes for a more discreet hook that is also more resistant to ultraviolet light.
  • 18/10 Equinox (18/10 stainless steel with black tinted resin): this material offers the same advantages as 18/10 stainless steel but is coated with a layer of black tinted resin. This makes for a more discreet hook that is also more resistant to ultraviolet light.